Debye to non-debye type relaxation in MoO3 doped glassy semiconductors: A portrait on microstructure and electrical transport properties

• Published in: Physica. B, Condensed matter Condensed matter, 2023-01, Vol.648, p.414374, Article 414374
• Main Authors: Halder, Prolay, Bhattacharya, Sanjib
• Format: Article
• Language: English
• Subjects: DC and AC conductivity; Electric modulus spectra; Electrical relaxation; Microstructure; TMI doped glassy semiconductors
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2022.414374

MoO3doped glassynanocomposites have been developed by melt quenching method. Micro-structural study reveals the distribution of CuO, Cu2O, ZnO and MoO3nanophases in the glassy matrices.AC conductivity spectra havestudied to reveal nonrandom and sub-diffusive motions of small polarons with a correlation with the network structures. It is significantly noted that as the MoO3 content is slightly added to the base system, DC conductivity value goes up slightly first and then goes down. This type of variation should be associated with their microstructures.It is noteworthy from the present study that relaxation times are very low for glassy systems containing lower MoO3 content and quite high for those containing higher MoO3 content.This change over of relaxation times suggests a desirable transition from Debye type to non-Debye type relaxation, which has also been validated with estimated values of maximum barrier height (WM). Debye to non-Debye type relaxation has also been from the estimated β values as well as current-voltage characteristics. A schematic model has been proposed to interpret the nature of conduction. Only ZnOnanophasescan be regarded as the controlling factor of stability of the resultant glassy system as it contributes to phonon dispersions. •New MoO3 doped ZnO - CuO glass-nanocomposites.•Various nanophases in the glassy matrices.•Nonrandom and sub-diffusive motions of small polarons with a correlation with the network structures.•Debye type to non-Debye type relaxation.•ZnO nanophases are the controlling factor of stability of the present system.